Birthday wishes for chachu in hindi are here who love your chachu. I call my Chachu as chachaji and i love him so much. Chachu/ Chacha is Father’s Younger Brother and is written as चाचा in Hindi. The nephews and nieces call their father’s younger brother as Chacha. Chacha is usually very close to his nephews and nieces being the younger brother of the father of kids. If you are looking for some greetings for birthday of Chachu/ Chacha, you have approached at the right page. Following are the best and colorful greetings for birthday of Chachu/ Chacha ji